So sánh phương pháp

	Phỏng vấn bán cấu trúc theo chiều dọc	Phương pháp Nhật ký
Lĩnh vực	Phương pháp luận khảo sát	Phương pháp luận khảo sát
Họ	Process / pipeline	Process / pipeline
Năm ra đời	1990s–2000s (as explicit methodology)	1920s–1940s (systematised by Allport, 1942)
Người khởi xướng	Rooted in longitudinal qualitative research traditions; systematised by Johnny Saldana and Rachel Thomson & Janet Holland	Gordon Allport (systematic social-science use); Nels Anderson (early fieldwork diaries)
Loại	Qualitative longitudinal data collection technique	Qualitative / mixed-methods data-collection technique
Công trình gốc	Saldana, J. (2003). Longitudinal Qualitative Research: Analyzing Change Through Time. AltaMira Press. ISBN: 978-0759100480	Alaszewski, A. (2006). Using Diaries for Social Research. Sage. ISBN: 978-0761941415
Tên gọi khác	LSI, repeated semi-structured interview, panel qualitative interview, longitudinal qualitative interview	diary study, diary technique, self-report diary, daily diary method
Liên quan	6	5
Tóm tắt	A longitudinal semi-structured interview study collects open-ended, guided interview data from the same participants across multiple time points. By returning to the same individuals — weeks, months, or years apart — researchers can trace how experiences, perceptions, and meanings change over time. The approach blends the flexibility of qualitative inquiry with the temporal depth that is impossible in a one-shot design, making it a cornerstone method in qualitative longitudinal research.	The diary method is a data-collection technique in which participants record their thoughts, behaviours, events, or experiences in their own words at regular or event-contingent intervals over a defined study period. By capturing data close in time to the event, diaries reduce retrospective recall bias and give researchers access to the texture of everyday life as it unfolds — something one-off surveys and retrospective interviews cannot provide.